Illusionist David Blaine will complete his latest endurance stunt on Monday by attempting to break the world record (8 min, 58 sec) for holding breath underwater.

The 33-year-old has spent seven days submerged in a water-filled sphere in New York, sustained by oxygen and feeding tubes.

The breath-holding feat, and bid to free himself of metal chains weighing 150lbs (68kg), begins at about 2115 (0215 BST).

The US showman shed 50lbs (23kg) in body weight to improve the efficiency with which his body uses oxygen, prior to embarking on the stunt.

Blaine's previous stunts include spending 61 hours inside a block of ice and fasting for 44 days in a perspex box over London's River Thames.